-29.27% is the change from 902 to 638
Calculation steps:
[( 638 - 902 ) ÷ 902] x 100 = -29.27%
Formula
Percentage change = [(638 - 902) / 902] x 100
Subtract the new number by the original number
638 - 902 = -264
-264 ÷ 902 = -0.2926829268292683
-0.2926829268292683 x 100 = -29.27%